(Reprinted June, 1913.) 



THE BRYOLOGIST, 



A DEPARTMENT OF THE FERN BULLETIN, 



DEVOTED TO THE STUDY OF NORTH AMERICAN MOSSES. 

 ISSUED QUARTERLY. 



EDITED BY DR. A. J. GROUT, PLYMOUTH, N. H., 

 To whom all correspondence regarding the mosses should be addressed. 



This department is issued separately at twenty-five cents a year. Sub- 

 scriptions should be addressed to the Fern Bulletin, Binghamton, N. Y. 



Vol. II. January, 1899. No. i. 



HEATER FOR GLYCERINE JELLY SLIDES. 

 By J. Franklin Collins. 



A FEW years ago while making glycerine jelly mounts by one 

 of the old, laborious methods (one which is still in use), it 

 occurred to me that there ought to be some more conven- 

 ient method devised. x\fter some experimenting, an apparatus 

 was constructed which seemed to answer the requirements of 

 economy and convenience. I have now been using it about three 

 years and find it a great improvement over the old method. Re- 

 cently Dr. G. G. Kennedy had one constructed with some slight 

 modifications. After it was completed I used it several times 

 and found it did the work as well, in every respect, as mine, and 

 had the advantage of being simpler in construction. 



The accompanying illustration and description embody the 

 better features of both heaters, though following the lines of Dr. 

 Kennedj^'s more closely than of mine. The figures are one- 

 fourth natural size, so that any dimensions not specially stated 

 can be ascertained by measuring the drawing and multiplying 

 by 4. 



A is a side view with the hand-rests removed; B shows a 

 portion of one end (the lamp end), with hand-rest (x) in place 

 and hand lens (/) removed, C (inserted within the contour of A 

 in order to economize space) is a plan of the cover s shown in A 

 and B. The base and supports {e} e-), as well as the hand-rests 

 (x), are of white- wood; all other parts are of brass or copper, 

 except /. 



The circular tank xa is connected with xb by the two ^ inch 

 pipes c^ and c~. xb is a rectangular box about 3>iXi>iX^, on 

 the flat top of which the blank slide is-pfaced to heat. This fiat 



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