Although the embryologist has long ago given up hope of being able to solve phylogeny any group animals by his own labours alone, it is nevertheless just as true to-day was in times he buoyed that hope, data Embryology, properly interpreted can and do furnish striking demonstrative evidences genetic relationships. That thesis constitutes main theme my discourse, course I show you how, starting from relatively simple generalised developmental conditions met with Lemuroidea, much more...

ABSTRACT “In mammalian embryology very many surprises are yet in store for us”(Hubrecht, ‘08).

ABSTRACT In recent years a great deal of attention has been paid to the reproductive processes in Mammalia, and particular phenomena connected with œstral cycle. Observations relating latter, however, have almost entirely based on Eutherian mammals, and, indeed, largely Primates (Heape (8, 9, 10), Van Herwerden (12), Hitschmann Adler (15), others) various domesticated or semi-domesticated Eutheria (e.g. sheep (16), dog (19), ferret (17), Marshall). Having at our disposal large volume records...

S ummary . The biology of the pouch‐young (mammary foetus) is considered in a graded series stages Dasyurus commencing with new‐born, still unattached young and ending fully developed animal at time it leaves maternal pouch (at age 4 to months) capable fending for itself. has been divided convenience into seventeen stages, labelled A‐P, growth, external appearances eruption teeth considered. problem migration new‐born pouch, their attachment nipples, mode lactation its duration have...

Background Three commonly used non-invasive protocols are implemented to estimate the timing at which PHV most likely occurs. Accurate estimation of circumpubertal years can aid in managing training load adolescent athletes.Aim were compared against observed age PHV: an 13.8 ± 1.0 – generic (from longitudinal measures); based on maturity offset equation, predicted ±1.0 year; a window 85–96% adult height time observation.Subjects and methods A final sample 23 28) male participants selected...

In recent years much attention has been given to the development of thymus and thyroid in Mammalia, with result that we are now possession more or less adequate accounts developmental history these structures representatives many mammalian orders, including Monotremata (Maurer, 34). As concerns Marsupialia, however, apart from a brief résumé results communicated by present authors Section D at Dundee (1912) Meeting British Association, no observations on origin extant. It is object paper...

The records of Australian biology bear sufficient witness to the fact that it is extremely difficult, even for residents in Australia, procure material necessary an investigation into development egg Ornithorhynchus. It only through organisation special expeditions, with ample resources both time and money, any large measure success this direction can be hoped for. animal itself, though pretty widely distributed, probably still far from becoming extinct, he found, one locality, comparatively...

The main and interactive effect of biological maturity relative age upon physical performance in adolescent male soccer players was considered. Consistent with previous research, it hypothesised that participants greater or born earlier the selection year would perform better terms tests. This cross-sectional study consisted 84 aged between 11.3 16.2 years from a professional academy English Premier League. Date birth, height, weight, parental height were collected. Sprint, change direction,...

The paper treats of certain stages in the intrauterine development egg Ornithorhynchus. dealt with include following:— (1)An early (eight-celled) stage segmentation. (2)A manifesting a later phase segmentation-process. (3)A germinal-layer formation, which cellular blastoderm is almost exclusively arranged form much-attenuated epithelial membrane covering part yolk-mass. arrangement on whole resembles that illustrated fig. 22, Taf. 8, and 33, 9, R. Semon’s work “Monotreme Development.”*...

The following account is based on a macroscopic and microscopic examination of the genital organs young (about half-grown) Myrmecobius measuring 11*5 cms.(snout to root tail).For opportunity examining this interesting somewhat rare form, I have thank Mr. Geo.Masters, Curator Macleay Museum.The only reference with which am acquainted contained in paper* by W. Leche, deals, however, mainly muscular anatomy, description female being quite short unaccompanied figures.No apology is, therefore,...

Failure of a transformer is costly incident which can impact power system operation and result in loss supply to customers. Transformers fail through number mechanisms, one from the formation bubbles within insulation. Currently, loading guidance set avoid certain overload temperatures as high temperature main cause forming. This paper analyses limit guides, comparing most commonly cited 140°C with values taken across full spectra available studies literature. It concluded that there...

ABSTRACT Our knowledge of the early development Cat, as indeed Carnivora in general, is singularly incomplete. Th. L. W. Bischoff, his classical monograph ‘Entwicklungs-geschichte des Hunde-Eies ‘published 1845, provided first account a Carnivore from unsegmented egg onwards and, considering date work, achievement was really remarkable one. In addition to later embryonic stages, he described and figured series segmenting ova blastocysts Dog, with such fidelity accuracy that is, even to-day,...

ABSTRACT Amongst the Monotreme material in possession of one us are two large slides sections a uterine egg Ornithorhynchus labelled c, diameter 6·75 mm. (No. 1, August 19, 1901). This particular was cut on sliding microtome, after embedding Stepanow’s clove-oil celloidin, at time Wilson and Hill were working up for their paper development (1) hope that it would exhibit an early phase cleavage. In this respect proved disappointment, being unsegmented, put side, though noted possibly stage...

ABSTRACT Since the appearance of Professor E. B. Poulton’s first announcement (1) his discovery true teeth mammalian type in a mammary-fœtal specimen Ornithorhynchus, several papers have appeared dealing with dentition this animal. Only one these (2), embodying more detailed account, by Poulton himself, own investigations, concerns developing prior to their eruption. The extreme difficulty procuring necessary material has hitherto stood way further research direction. stage investigated is...