480 THE SECRETARY ON ADDITIONS TO THE MENAGERIE. 



permanent retention of the larval organisation may ))e re^ai'ded 

 as definitely established hy the work of Gudernatsch, Bennet 

 Allen, Hoskins, Swingle, Morse, Uhlenhuth, and othei's. There 

 are ample indications th;i,t the thyroid gland is not alone in 

 influencing the developmental processes of Batrachians. Several 

 recent workers, notably Allen, have demonstrated the failure of 

 Anuran tadpoles to undergo metamorphosis after the ablation 

 of the pituitary (anterior lobe) rudiment. But our knowledge of 

 the function of this organ is very slight. 



" A short while ago the author, in collaboration with Mr, 

 Julian Huxley, independently confirmed Laufberger and Jensen's 

 claim to have induced sexually mature larva? of the neotenous 

 Mexican Salamander to assume the adult form by treatment with 

 ii diet of mammalian thyroid. It was not possible after many 

 attempts to obtain this result with pituitary (anterior lobe) gland 

 substance administered per os. Recently it has been found 

 possible to induce year-old Axolotls in Prof. MacBride's laboratory 

 ,at the Imperial College of Science to transform after tri-weekly 

 intravenous injections of anterior lobe extracts. The injections 

 of '3 cc. Ringer extract of equivalent to 2 grains fresh gland (ox) 

 were made via the anterior abdominal vein. The animals were 

 fed on raw beef tri-weekly, and kept in deep water till the 

 completion of metamorphosis at the conclusion of one month 

 from the beginning of the treatment. The time required by this 

 method is tlius the same as that in the case of thyroid dieting — 

 conspicuously less than with the shallow-water treatment of 

 Mile, de Chauvin and E. G. Boulen^er." 



April 25th, 1922. 



Sir Sidney F. Harmer, Iv.B.E., F.R.S., Vice-President, 

 in the Chair. 



The Secretary read the following Report on the Additions to 

 the Society's Menagerie during the month of March, 1922 : — 



The registered additions to the Society's Menagerie during the 

 month of March were 157 in number. Of these 61 were 

 acquired by presentation, 20 were deposited, 70 were purchased, 

 2 were received in exchange, and 4 were born in the Mena.gerie. 



The following may be specially mentioned : — 



3 Alpine Marmots (Ilarmota viarmofa), from Argentieres 

 Haute Savoie, presented by Major J. R. Peploe on March 27th. 



3 Canadian Tree-Porcupines {Erithizon dorsatus), from 

 N. America, received in exchange on March 22nd. 



2 Reindeer {Rangifer tarandus), from Norway, purchased on 

 March 21st. 



