The following displays the results obtained by using the same material, in same quantity, but differently disposed, 16 grains of each: --------+------+--------+-------+------+------+------+------+------+----- | |Sewing | | | | | | | | |or | | | | | | |Linen Heat | |knitting| |Woolen| |Cotton| |Linen |Cloth lost or | |silk | |Thread| |Thread| |Thread|wrap- amount | |wound |Sheep's|wound |Cotton|wound | |wound |-ped of |Raw |round |wool, |round |wool, |round |Lint, |round |round cooling.|Silk. |bulb. |loose. |bulb. |loose.|bulb. |loose.|bulb. |bulb. --------+------+--------+=======+======+------+------+------+------+----- 70° | -- | -- | -- | -- | -- | -- | -- | -- | -- 60 | 94"| 46" | 79"| 46"| 83"| 45"| 80"| 46"| 42" | | +-------+------+ | | | | 50 | 110 | 62 | 95 | 63 | 95 | 60 | 93 | 62 | 56 | | +-------+------+ | | | | 40 | 133 | 85 | 118 | 89 | 117 | 83 | 115 | 83 | 74 | | +-------+------+ | | | | 30 | 185 | 121 | 162 | 126 | 152 | 115 | 150 | 117 | 108 | | +-------+------+ | | | | 20 | 273 | 191 | 238 | 200 | 221 | 179 | 218 | 180 | 168 | | +-------+------+ | | | | 10 | 489 | 399 | 426 | 410 | 378 | 370 | 376 | 385 | 338 --------+------+--------+=======+======+------+------+------+------+----- Tot. | | | | | | | | | times. |1,284 | 904 | 1,118 | 934 |1,046 | 852 |1,032 | 873 | 786 --------+------+--------+-------+------+------+------+------+------+----- From this it is to be seen that sheep's wool loose would retard the passage of heat more perfectly than when spun into thread. THE "JAROS HYGIENIC MATERIAL" _of sheep's wool unspun worn next the body possesses the essentials for non-conduction of heat in a manner described_. It is an instance how an effort to apply pure science to practical business may react in such manner that practical business shall become a beneficent contributor to pure science. Another practical question suggested is: Whether clothing materials differ in their powers of absorbing the cutaneous exhalations; if so, which are the most effective, and what are the relations of this function to that of confining air, and thereby maintaining the temperature of the body? If these two functions are opposed, then how shall we effect a compromise? If, on the other hand, they go together in any special material, the desirability of using this material is doubly indicated.