ON THE ACTION OP THE METHYL AND ALLIED SERIES. 155 



= the parts of one i-evolutioii of the index for one revolution of the disk — that is, 



_ 11 

 Dmn 



And because ^j- X — to— = foot-pounds represented by one revolution of the disk 



, . , . , . 31416w.r ., „ 



per one cu'cular inch of the piston, = — roj2 — > thereiore 



3-l4lCnrx Dmn Z-UlGDmnwx 



X 



12d' ^ 21 ~ 2-ild^ 



= foot-pounds per one revolution of index. Or, assume one revolution of index 

 = 10,000, then 



3-14mi)mnwx .^_„ , _ lAO^OOOld'^ 76.394-194^(Z^ 



Mld^ = ^"'"*^ " ~ WhmDin^' - Bmnw ' 



Therefore each unit on the dial of the power-meter represents 1000 foot-pounds per 

 circular inch. 



To find the Worlc done hy an Engine in any given time. 



When d = the diameter of the engine-cylinder in inches, n = the number of the meter- 

 index at commencement of time, ii = the number of the meter-index at the end of that 

 time, therefore 



\GQQiny — n)d = foot-pounds. 



To find the worlc done in Horse effect. 



Where m = number of minutes elapsed between the time of reading the meter, and 

 33,000 foot-pounds represents the duty of one horse per minute, then 



— — ^-J ~ . —^\ = load m horse-powers. 



33,000»i S6m ^ 



To find the quantity of Coal consumed per Horse per hour. 

 Let n — horse effect of the engine, h = hours during consumption of the coal^ 

 w = the vreight of coal in lbs., and r — the number of lbs. of coal consumed per 



hour ; also 



1000(^;i -«)<?3 ^ K^'y- 

 33,000 xOOA -^~ 1980A " • 



And J- — lbs. of coal consumed per horse per hour, therefore 

 H 



«' X 1 w 1980/2 lOSOiti 



h H li {n^ — n)d {i\^ — ii)d 

 — consumption of coal per horse per hour. 



Report on the Action of the Methyl and Allied Series. 

 By Benjamin W. Richardson, M.D., F.R.S. 



In my last Report to the Associatiou I classified uuder five heads the vari- 

 ous substances the action of which I had studied in a phj^siological point of 

 view, viz. the Hydrides, Nitrites, vUcohols, Chlorides, and Iodides of Methyl, 

 Ethyl, Butyl, and Amyl. In my present report I have retained the same 

 order of classification of organic substances, so as to ensure a systematic and 



