and Laboratory Methods. 



2669 



A Barnes Dissecting Stand. 



The accompanying photograph of a Barnes dissecting stand illustrates some 

 modifications which I recently had made, and which I find add considerably to 

 its value. The holes for the lenses are of such a size that they fit snugly, and 

 the hinged cover may be fastened with a hook, thus keeping the contents securely 



ia place. The drawer holds teasing needles, forceps, and camels hair brush. 

 While this stand is somewhat more expensive than the usual form, I find that its 

 greater convenience amply compensates for the increased cost. 

 Textile Laboratory, Western Electric Co- CHARLES E. M. FiSCHER. 



On the Use of " Sea- Lettuce " (Ulva) in Orienting Small 

 Objects for Sectioning. 



The various methods of orienting small objects for sectioning may conven- 

 iently be classified into three groups ; (1) the methods of orientation by sticking 

 objects on a thin plate before embedding, (2) those of orienting objects in 

 melted paraffin, and (3) those of orienting objects after embedding. As the second 

 and third groups do not concern us here, I shall briefly mention what methods 

 belong to the first. This group again includes three classes, according to the 

 period at which the object is fastened : (A) Fastening the fresh object by means 

 of a fixing fluid with or without albumen fixative, (B) fastening the object pre- 

 served in alcohol by means of albumen fixative and alcohol, and (C) fastening the 

 object after being clarified by means of Schallibaum's fixative. 



Under A, I may mention Hacker's^ and Schydlowski's^ methods. Hacker 

 used the following method in embedding the egg of Myzostoma. The eggs are 

 placed with a very little water on a piece of Ulva spread on a watch-glass ; then 



1 Hacker, V. Praxis u. Theorie d. Zelle u. Befruchtungslehre, p. 



2 Schydlowski, A. Zeit. wiss. Mikr. Bd. 13, pp. 200-204, 1896. 



1 1, 1899. 



