PART I.
Elements of Pharmacy.
19
used in France since the revolution, begins at the freezing-point of water, which is consequently marked 0, and the spacebetween that and the boiling point is divided into 100 equaldegrees; hence it has been named the Centigrade Thermome-ter. Each degree of this scale is £ths more than a degree ofFahrenheit's, or one of the latter is equal to |ths of a degreeof the centigrade scale. To find, therefore, the degrees ofFahrenheit's scale, corresponding to those of the centigrade,the given number of the latter must be multiplied by 9, anddivided by 5, adding 32 to the quotient: the sum expressesthe degree on the scale of Fahrenheit.
Reaumur's thermometer, which is still used in Italy andSpain, also commences at the freezing point, which is marked
0 : and between this and the boiling point it is divided into 80degrees. Each degree is, therefore, §ths more than one ofFahrenheit's; and to reduce those of Reaumur to Fahrenheit's,the given number of the former must be multiplied by 9, anddivided by 4, adding 32 to the quotient. 1
1 TABLE showing the degrees of Reaumur's and Fahrenheits thermometers
corresponding with those of the centigrade thermometer.
Cent./ReauJ Fahr.
/] Cent
jReail.J Fahr.
II Cent
)l{eau. Fahr
.1 Cent
-Reau
. Fahr.
100
(80- [HIS-
( 68
'54-4/ 154-4
36
28-8
96-8
1 5
/ 4 -
/41-
99
79-2
210-2
67
53-6
152-6
35
28-
95-
4
3-2
39-2
98
78-4
208-4
1 66
52-8
150-8
34
27-2
93-2
3
2-4
37-4
97
77-6
206-6
| 65
52-
149-
33
26-4
91-4
2
1-6
35-6
95
76-8
204-8
64
51-2
147-2
32
25-6
89-6
1
0-8
33-s
95
76-
203-
! 63
50-4
145-4
31
24-8
87-8
0
0-
32-
94
75-2
201-2
1 62
49-6
143-6
30
24-
86-
1
0-8
30-2
93
74-4
199-4
! 61
48-8
141-8
29
23-2
84-2
2
1-6
28-4
92
73-6
197-6
! 60
48-
140-
28
22-4
82-4
3
2-4
26-6
91
72-8
195-8
59
47-2
138-2
27
21-6
80-6
4
3-2
24-8
90
72-
194-
58
46-4
136-4
26
20-8
78-8
5
4-
23-
89
71-2
192-2
57
45-6
134-6
25
20-
77-,
6
4-8
21-2
88
70-4
190-4
56
44-8
132-8
24
19-2
75-2
] .7
5-6
19-4
87
69-6
188-6
55
44-
131-
23
18-4
73-4
i 8
6-4
17-6
86
68-8
186-8
54
43-2
129-2
22
17-6
71-6
9
7-2
1 5-6
85
68-
185-
53
42-4
127-4
21
16-8
69-8
10
8-
14-
84
67-2
183-2
52
41-6
125-6
20
16-
68-
11
8-8
12-2
83
66-4
181-4
51
40-8
123-8
19
15-2
66-2
12
9-6
10-4
82
65-6
179-6
50
40-
122-
18
14-4
64-4
13
10-4
8-6
81
64-8
177-8
49
39-2
120-2
17
13-6
62-6
14
11-2
6-8
80
64-
176-
48
38-4
118-4
16
12-8
60 8
15
12-
5-
79
63-2
174-2
47
37-6
116-6
15
12-
59-
16
12-8
3-2
78
62-4
172-4
46
36-8
114-8
14
11-2
57-2
17
13-6
1-4
77
61-6
170-6
45
36-
113-
13
10-4
55-4
18
14-4
0-4
76
60-8
168-8
44
35-2
111-2
12
9-6
53-6
19
15-2
2-2
75
60-
] 167-
43
34-4
109-4
11
8-8
51-8
20
16-
4-
74
59-2
j 165-2 \
42
33-3
107-6
10
8-
50-
21
1C-8
' 5-3
73
58-4
163-4
41
32-8
105-3
9
7-2
48-2 1
22
17-6
7-5
72
57-6
161-6
40
32-
104-
8
6-4
46-4
23
18-4
9-4
71
56.8
159-8,
39
31-2
102-2
7
5-6
44 -3
24
19-2
11-2
70
56-
158- ]
38
30-4
100-4
6
4-8
42-3
25
20- 13-
69 I
55-2
156-21
37
29-6
98-6
1
c 2