400 MALL. [Vou. XII. 
Nearly all of the embryos were drawn or photographed to 
scale and then carefully cut into sections from ten p to fifty 
thick. I find that for purposes of reconstruction it is a mistake 
to cut the sections very thin. Yet in small specimens, as Nos. 
XI and XII, the specimens were cut thin to permit of careful 
LIST OF EMBRYOS STUDIED. 



LENGTH IN MILLIMETERS. 
No. LSS FROM WHOM OBTAINED. 
Vv. Bt N. B. 
XI — — Dr. Kittredge, Nashua, N. H. 
XII PA _ Dr. Ellis, Elkton, Md. 
Ill 252 — Prof. His, Leipzig, Germany. 
XIX 5:5 4.5 Dr. Williams, Baltimore, Md. 
SVT Cie Fe Dr. Douglas, Nashville, Tenn. 
II 3 Te Dr. C. O. Miller, Baltimore, Md. 
IV — oh Dr. Williams, Baltimore, Md. 
XLII 15. 13. Dr. Booker, Baltimore, Md. 
VIII 7s 14. Dr. Ritter, Brooklyn, N. Y. 
IX 17. 14. Dr. Eycleshymer, Chicago, II. 
Vv 18.5 17 Dr. Kittredge, Nashua, N. H. 
XLII 18. 15. Dr. Wills, Los Angeles, Cal. 
XVII 18. 16. Dr. Cottrell, Louisville, Ky. 
XXVIII 19. 18. Dr. Sewall, Denver, Col. 
VII 19.5 18. Dr. Booker, Baltimore, Md. 
XXII 20. 18. Dr. Snively, Waynesboro, Penn. 
VE 22% 20. Dr. Howard, Cleveland, Ohio. 
VI 24. — Dr. C. O. Miller, Baltimore, Md. 
x 24. 20. Dr. W. S. Miller, Madison, Wis. 
X<OEV 28. 15) Dr. Douglas, Nashville, Tenn. 
XXXIV 80. 60. Dr. Ellis, Elkton, Md. 
XLVIII 130. 110. Dr. Wilson, Worcester, Mass. 




without placing the embryo first in weak alcohol, it naturally passes through the 
successive dilutions of alcohol before it is completely hardened. 
It is very injurious to these delicate specimens to be wrapped in cotton before 
they are sent by mail or express. A perfect method is to place the preserved 
specimen in a bottle filled completely with alcohol, thus imitating the condition 
of a foetus in utero. If there is no air or cotton in the bottle containing the 
embryo it is almost impossible to injure the embryo by shaking it. 
Since I have emphasized this method of preservation (Johns Hopkins Hospital 
Bulletin, 1893), I have obtained a number of specimens excellent in every respect. 
These specimens are not distorted, nor macerated, nor shrunken. 
1 V. B. and N. B. indicate the length of the embryo measured from the vertex 
to the breech and from the nape of the neck to the breech, respectively. 
