i8 
Dr. Wollaston's Synoptic Scale 
analyses upon record, in whatever numbers the results of those 
analyses may happen to be expressed. 
I hope, that without trespassing too much on the time of 
the Society, I shall have rendered the principle and practical 
use of this scale intelligible. I trust, that it will prove useful 
as an assistant to chemists in general. It will at least serve 
for a specimen of the extreme facility of mechanical approxi- 
mation, which may very frequently be advantageously sub- 
stituted for computations, that are often more laborious than 
the accuracy of our data warrants ; and if it tend to introduce 
into more general use, that valuable instrument the common 
sliding-rule, it will be the means of saving no inconsiderable 
portion of time to those who are engaged in scientific pur- 
suits. 
Numerical Table of ‘Equivalents. 
Hydrogen 
Oxygen 
Water - 
Carbon 
Sulphur - 
Phosphorus 
Azote 
Muriatic Acid (dry) 
Chlorine 
Oxalic acid - 
Ammonia 
Soda 
Potash 
Magnesia 
Lime 
Strontia 
Barytes 
Iron 
[g) 
(o) 
(«) *»32 
■ 10,00 
11,32 
(^) 7>54 
(/) 20,00 
17,40 
i7>54 
(0 34>I 
44»i 
(Z>) 47>o 
(/>) 21^5 
(0 39 ‘* 
(m) 59,1 
(«) 24,6 
( c ) 35^46 
(k) 69, 
(0 97 * 
(r) 34^5 
4- 20 Oxygen rr 27,54 Carbonic acid. 
4- 30 Oxyg. r: 50 Sulphuric acid. 
4- 20 Oxyg. rr; 37,4 Phosphoric acid. 
4- 50 Oxyg. = 67,54 Nitric acid (y). 
4- 10 Oxyg. 44,1 Oxymuriatic acid, 
r: Oxymur. acid 4- 1,32 Hydrog. rz 45,42 Muriatic gas. 
10 Oxyg. 
10 Oxyg. 
~ 29,1 Sodium. 
3= 49,1 Potassium. 
— 10 Oxyg. =: 25,46 Calcium. 
4- 10 
+ »5 
Oxyg. rr 44,5 Green Oxid of Iron. 
Oxyg. 49 j 5 Red Oxid. 
