another year you had a larger class you could, if you wished, 
substitute for the 100 Esnqm candle power lamp (which costs alone 
$2.00) a 90° arc lamp (which is interchangeable in the above mentioned 
lantern). This are lamp would cost $18.00, plus $9.00 for a rheo¬ 
stat (which would be necessary), or, for $27.00, a lamp that would 
give you as powerful a stereopticon as any one would want for a large 
assembly hall,and one which could be used where the room is suffic¬ 
iently light for students to take notes throughout the lecture, as 
all curtains need not necessarily be drawn. 
Again, if you had a lantern I would gladly loan you any of my 
slide's, whenever I am not actually using them myself (I do not often 
use them), if you do not feel that you want to purchase many immediate¬ 
ly. Furthermore, I am equipped to make lantern slides at almost 
any time, and could help you out in this respect if you wished it. 
I would strongly urge you to seriously consider the stereopticon. 
There is a department here at Brown where they have,in the past,used 
enlargements; they are now using lanternslides almost entirely, I 
believe. 
Am sorry that I shall not see you Friday evening. You will 
miss the "Rambles"! I have the labels ready to take with me. 
I hope you will have a fine snow-shoeing trip, and come back with 
lots of reserve vigor. 
Cordially 
