215 



"candlelabra" division of the carotid at Strassburg and Breslau, being 

 20 ^lo in the former and 60 "/o in the latter. 



The average absence of the pyramidalis is very different in the 

 Strassburg and the Boston dissecting rooms. I incline to believe that 

 it may be a characteristic of race; but the race my observations 

 represent is not that of Massachusetts. 



Finally we have the absence of the psoas minor which is parti- 

 cularly interesting. 



Grubee 1500 cases absent in 48,7 ^j^ 



Schwalbe & Pfitzner 561 „ ,, „ 56,7 ,, 



DwiGHT 608 „ „ „ 60,5 „ 



English Anat. Society 914 „ „ „ 64,3 „ 



This is perplexing; for all the numbers are reasonably large. My 

 material should not be very different from that of the English ana- 

 tomists. Why is it that the average is half way between those of 

 England and Strassburg? Is it because thousands of observations are 

 necessary for a true average, or that the material both in America 

 and Great Britain is not sufficiently homogeneous? Whatever may 

 be the truth about the first alternative, I believe that the latter gives 

 a sufficient explanation. One thing is certain, namely that the Kussian 

 results differ widely from all others. 



I hope it is needless for me to say in conclusion that nothing 

 is further from my purpose than to disparage the work of Professors 

 Schwalbe and Pfitzner. On the contrary it is because I appreciate 

 so highly its value and the scientific spirit in which it is conducted 

 that I am anxious to point out what seems to me a source of error. 



Boston, Harvard Medical School, 

 Aug. 13th 1894. 



Nachdruck verboten. 



Beitrag zur Keimblätterlehre und Eiitwiclcelungsmeclianili 

 der Ascidieiiknospung. 



Von Dr. Johan Hjoet (Christiania). 

 Mit 5 Abbildungen. 



Die Knospenbildung der zusammengesetzten Ascidien hat bekannt- 

 lich schon lauge die größten Schwierigkeiten geboten für jeden, der 

 sich auf den Grund der herrschenden Keimblätterlehre stellt. Van 



