1870.] 



on the Human Economy, 



515 



Table I.— To show the effect of tropical weather on the capacity of the 

 chest, as indicated by the spirometer. 





Age. 



Height. 



L 



Temp, zone 

 near England, 



at sea, 

 June 23, 1869. 

 Therm. 65° F 



Hygr. 2|° F.' 



2. 



Tropics 

 lat. 13° SJ at 

 sc3> in cc|U3,to~ 

 rial doldrums, 

 o uiy i^. i ov*. 

 Therm. 78° F. 

 Hygr. 4° F. 



3. 



TropicSj 

 lat. 70° S., at 

 S(?a in equato- 

 rial doldrums, 

 Aug. zu, ipoy. 

 Therm. 83° F. 

 Hygr. 4° F. 



4. 



Temp, zone, 

 near England, 



at sea, 

 Sept. 11, 1869, 

 Therm. 65° F. 



Hygr. li°F. 



5. 



Temp, zone, 

 England, 



Plymouth, 

 Feb. 10, 1870. 

 Therm. 42° F. 



Hygr. o° F. 







ZO 



ft. 



in. 



cub. ins. 



cub. ins. 



cub. ins. 



cub. ins. 



cub. ins. 





( Wright ir 



5 m 



288 



315 



324 



300 



288 



a 'S a 



Scaulan * 



OA 

 ZK) 



5 



u 



222 



5500 



2o4 



240 



236 



OS t3 



Rodd* 



OO 



— s 



5 



idi 



303 



oZi 



327 



300 



288 



TJ1 — ' 





OO 

 Zv 



5 



7 



240 



zbi 



270 



234 







f Maclean # . • 



OQ 



zo 



5 11 



321 



350 



360 



330 



318 





Knott 



Oft 

 ZO 



5 



7i 



219 



O-l Q 

 Zio 



24b 



234 







Rattray # 



QQ 

 OO 



5 



7i 



219 



246 



258 



234 



224 





Norcott # 



OA 

 ZK) 



5 



74 



216 



240 



O 1 B 



231 



215 





Can* * 



25 



6 



0* 



256 



294 



303 



258 



255 







20 



5 11 



285 



316 



318 



276 



274 



5* ^ 



<V i—i 



Walter * 



orr i 



5 



8| 



207 



zbo 



300 



270 



252 







34 



5 



9 



237 



237 



243 



216 



213 







39 



5 



11 



222 



230 



... 











31 



5 







240 



255 



238 



228 





Yesting 



22 



5 







243 



255 



247 



... 







22 



6 



3 







288 



252 









23 



5 



8| 







270 



231 







v Huyghue 



50 



5 



4 





198 



198 



180 







f Fisher 









... 





152 



150 









m . 









162 



140 





o <a J 





16*1 . 









153 



149 









16| . 









180 



165 









16^ . 









171 



156 









- 











153 



180 





Average capacity of the 

 12 marked *. 

 „ gain (by heat) . 



„ loss (by cold). . 



Percentage of gain in 

 the tropics 







256-083 



280-75 

 24-833 

 v , 



31-4 

 12-24 



287-416 

 6-5833 



163 



26025 

 26-333 



253-727 

 6-523 



This gives the results of observations with the spirometer on 24 healthy 

 individuals, made during the voyage from England (lat. 51° N.) to Bahia 

 (lat. 11° S.) and back. Four of these were strong, full-chested, adult 

 seamen, fourteen healthy adult officers, and six young growing lads. In 

 the twelve marked by an * the experiments were carried on throughout. 

 Column 1 shows the capacity in the temperate climate of England during 

 summer (June, average temperature 65° F., shade). The average of these 

 twelve cases gives 256 cubic inches. Column 2 gives the capacity, nineteen 

 days afterwards, in the equatorial doldrums and greatest heat (78° F., shade) 

 of the outward voyage, and shown that this had increased to 280 cubic inches, 



