246 G. H. KNIBBS. 
ligible fact, or such a result say as could be expected when 
the total area considered was divided into approximately 
equal areas with homogeneous populations. 
Neglecting these defects and forming groups for approxi- 
mately every change of 5 units in the rate of infantile 
mortality, as ordinarily reckoned, viz. deaths per 1000 born, 
the following results are obtained :— 
TABLE II. 
Effect of Infantile Mortality on Birthrate. 
Sin Vert or 4 a cease ze = 
faSScigdas| BS | a5 | 88S sea 4lcaee| 2S | as | aay 
2U2/bEne| 2 | HS | SEE SSLE| BEne| BS | HS | a8 
Msszioaee| G2 | ae | 88S esse Saas) ab | ae | 68a 
| 688 | 3414 29 99 68 | 206°4| 36°73 | 218'4 | 8022 |16557 
| 71:0] 26°32 38 100 71 || 211°5| 37°15 | 268-7 | 9983 |21117 
| 769] 31°58 | 22:1| 698 | 537 | 217:9| 36°81 | 106:0 | 3902 | 8503 
| 823] 30:30 | 134] 406 | 334 | 221-3) 37:96 | 69-1 | 2623 | 5805 
| 87:°7| 2815 | 13:0) 366 | 821 | 226:0| 37:96 | 183°5 | 5068 |11454 
91:8 | 26:33 | 163°3 | 4300 | 3948 | 230°0| 37°52 | 26:2] 983 | 2261 
95°9 | 26:23 | 125°6 | 3294 | 3158 || 237:°2| 38°68 | 68:2 | 2638 | 6258 
101'8 | 26°5u | 115°2 | 3053 | 3108 || 240°6 | 46°55 | 143°1 | 6662 |16026 
|106°7 | 2890 | 96-3 | 2783 | 2970 || 248°0| 47°77 | 167°9 | 8021 |19892 
| 111°38 | 29°47 | 98°7 | 2909 | 8237 || 251°4| 49°95 | 280°0 |13426 |33749 
| 1169 30°92 | 543) 1679 | 19638 | 255°9 | 47°63 | 104°6 | 4982 |12747 
| 123°2 | 29°80 | 1144 | 3409 | 4198 | 260°1| 47:91 | 99°0 | 4743 |12335 
3 | 28°44 | 163°9 | 4661 | 5947 | 265°1 | 48°64 | 95°4 | 4640 |12299 
131°7 | 30°37 | 383°9 |11658 |15351 | 272°8 | 46°74 | 287-9 |13457 |36713 
|187°0 | 27°89 | 514°2 |14339 [19638 | 277-1 | 48-32 | 1861 | 8993 |24921 
~ 
bo 
“J 
op 
| 142°0 | 27°35 | 570°6 |15608 |22170 | 2800) 49:52 | 93°6 | 4635 |12978 
|147:4 | 29-90 | 402°6 |12038 |17750 | 289°0| 48°60 | 92-0 | 4471 |12920 
1519 | 29°72 | 687-1 |20423 [31028 | 292:0| 35°67 | 3:0] 107 | 312 
| 156-6 | 29°11 | 360°1 |10484 |16422 | 3040] 3633 | 30] 109 | 831 
1161-8 | 27-69 | 466-9 |12927 |20910 | 307-0 | 46-41 | 96-1 | 4460 |13692 | 
| 166-3 | 28°93 | 433-5 |12543 |20859 | 313:0| 36°67 | 3:0] 110| 344 
| 172-4 | 29-88 | 2243 | 6697 [11547 | 329°0| 3452 | 81] 107] 352 
1762 | 30°62 | 205-0 | 6278 |11064 || 332°5| 39°26 | 54] 212] 705 | » 
183-0 | 32-00 | 279-7 | 8951 |16381 | 337°0| 35°81 | 31] 111 | 374 
| 186-8 | 34:98 | 165°8 | 5800 |10832 || 344°0| 33:87] 31] 105] 361 
192'4 | 36:41 | 189°9 | 6915 |18366 | 349°0| 37-42 | 31] 116) 405 
| 197:4| 35°92 | 275:4 | 9893 |19532 || 366-0| 3625/ 64| 232 | 849 
203:2 | 36:00 | 257:8 | 9280 |18854 | 412°0| 3815! 27| 108! 424 
These results are shewn in Fig. 2 in which curve A (firm 
lines) represents a simple type of curve closely conforming 
to the results and having regard to their weights, and curve 
B (broken lines) a more complex type still more closely 
