New Dorp, Staten Isalnd, 
July 24th, 1894. 
J.F.Collins, 
Dear Sir, 
It gives me great pleasure, to learn 
that you ahave found anything in my simple little moss leassons 
that will help you in your work. I fear that from your not,knowing 
anything abotit the mica slides , they are not as much used for Al¬ 
gae, as I at first supposed. I had a box of them given me labelled 
mica slides lor Algae" in Dr. Morongs hand-writing, and as I knw 
that he was to have collected characeae for Dr. Allen in Paraguay, 
I suppos d they came already cut. Im learned afterwards that he had 
them cut for his own use. I enlocse a moss side which you may keep, 
and the ordinary slide I use for first examination is the glass one 
standard size, one inc h wide by 3inches long, with round cover gls 
I find this will do for boiling over a lamp. At night I hold it 
over tye chimney of my Student lamp, and in the dayntime I use a 
candle or an alcohol lamp.As you say the great beauty is to be 
able to keep them with the specimens, and I also find that focusing 
with a high power , I occasional'y break a cover glass, an utter 
impossibility with these slides.D9 you know Mr. Brldgham ? His horiB 
ior the summer is at East Providence Centre, and he is doing some 
drawings for me. I think he would be gid to show you some of his 
slides. 
Very sincerely, 
E.G.Britton. 
