No. 505] 



NOTES AND LITERATURE 



57 



changes in the soma. However, they are the species as we have 

 them and it seems a hopeless task to go through the animal 

 kingdom and sort the named forms into "ontogenetic" species 

 and "orthodox" species. We shall probably be forced to recog- 

 nize that the names we give are merely convenient shorthand 

 descriptions of certain organisms, some of which are extremely 

 stable as to form and coloration, others not so much so. Our 

 problem is, then, to find out as much as we can about the causes 

 which bring about the differences which we note. 



A new journal, Zeitschrift fur IixJuktin Abstammungs- und 

 Vererbungslehre, has just been started. With Baur, Correns 

 and other authorities as editors, much is to be expected of it. 



Frank E. Lutz. 



Bachmetjew, P. Experimented Entomologische Studien vom 

 physikalisch-chemischen Standpunkt aus. Zweiter Band. 

 Einfluss der aussern Faktoren auf Insekten. xevi + 944 pp. 

 with 25 plates. Sophia. 

 Federley, Harry. Uber den Albinismus bei den Lepidopteren. 



Acta Societatis pro Fauna et Flora Fennica, XXXI, No. 4. 

 Marchal, P. Comptes rendus Soc. de Biologie, July. LXV, 

 No. 24. 



Powers, J. H. Morphological Variation and its Causes in 

 Amblystoma tigrinum. Studies from the Zoological Labora- 

 tory, the University of Nebraska, No. 71. 77 pages with 9 

 plates. 



EXPERIMENTAL ZOOLOGY 

 The Influence of the Size of the Egg and Temperature on the 

 Growth of the Frog. 1 — What determines the difference in size of 

 two animals? It is the difference due to greater or less number 

 of cells, or, perhaps, to a difference in the size of their cells? 

 Does the animal grow by adding more new cells, or by increasing 

 the old cells? These are some of the problems which confront 

 the student of the phenomenon of growth in the animal and 

 plant kingdom alike. 



The paper, the subject of this review, contains an account of 

 experiments which attempt to throw light upon these problems. 



1 Einfluss der Eigrosse und der Temperatur auf das Wachsthum und die 

 Grosse des Frosches und dessen Zellen. Von Kobert Chambers, Arch, fur 

 Mikroskopische Anatomie und WHtwidchmffW srhichte, Vol. 72, Part 3, pp. 

 607-661, 1908. 



2. 1908. 



3. 1908. 



