[ 499 1 



APPENDIX. 



Of the Manner of taking Obfervatiom on the Hygrometer and of 

 corre&ing its Indications. 



The hygrometer fliould habitually be kept loofe under a glafs 

 jar, to prevent it from being fouled by flies or duft. Obfervations 

 fliould be made in the open air and in the (hade at a diftance from 

 houfes or refleded heat. It requires but about two minutes to ar- 

 rive at its proper height. But the obfervations thus taken muft b& 

 €orreded by the taMe that follows i 



TABLE 



