567 



1) The thyroid outgrowth begins at the hyomaodibular pocket 

 and not at the second branchial pocket. 



2) The cells separated froni the anterior part of the outgrowth 

 are taken into the mylohyoidial muscle, and do not form an accessory 

 thyroid. 



3) The suprapericardial bodies ("postbranchial", of Maurer) are 

 paired, developing on the right as well as on the left side of the 

 embryo. 



4) These bodies lie in the plane of the second vagus cleft (fourth 

 branchial beginning with the hyomandibular) and are followed by a 

 third vagus cleft. Hence they cannot well be regarded as rudiments 

 of a posterior branchial cleft. 



Cambridge, Mass. Dec. 21, 1895. 



Nachdruck verboten. 



Formaldehyde, Formaline, Formol. and Formalose. 



By G. H. Pakkek and R. Floyd '). 



In No. 8 of the current volume of the Anatomischer Anzeiger, 

 A. B. Lee opportunely calls attention to certain inaccuracies in the 

 use of the terms formol, formaline, and formaldehyde, and cites our 

 paper "The Preservation of Mammalian Brains by Means of Formol 

 and Alcohol'" (Anatomischer Anzeiger, XI, p. 156) as one of several 

 in which these mistakes occur. It would be a cause of regret to us, 

 if we had been instrumental in adding to the confusion in this matter, 

 but, as we believe our paper to bo free from the defects ascribed 

 to it by Lee, we take this opportunity of correcting any misappre- 

 hensions in the matter. It will be simplest to reply directly to Lee's 

 comments on our paper. 



We recommended the use of a '2^jq solution of formol, and by 

 that we meant, as Lee says one would naturally think, a mixture of. 

 2 volumes of formol with 98 volumes of water. This solution would 

 of course contain something less than 1 % formaldehyde , and yet 

 when mixed with the amount of alcohol given in our formula, it 

 hardens sheep's brains in about a week. Although Lee seems to 

 question this statement, we believe a trial will convince him of its 

 truth. What could have led him to suppose that we meant 2^1^ form- 



1) Contributions from the Zoological Laboratory of the Museum of 

 Comparative Zoology at Harvard College, E. L. Mark, Director, No. LIV. 



