QyQ PHILOSOPHICAL TRANSACTIONS. [aNNO 1723. 



air from the same place, towards the opposite parts, and thus exhausting it as 



it were. 



Further to improve this part of natural history therefore. Dr. Jurin recom- 

 mends the curious to mark in their diary, once a day at least, the height of the 

 barometer and thermometer, the course and strength of the wind, the face of 

 the heavens, the rain or snow, as also the observations with the microscope and 

 the magnetical needle. 



Dr. J. gives directions for chusing, filling, and using barometers, thermo- 

 meters, and rain-gauges, &c. He recommends, for the sake of comparison, 

 that all observations be made at the same hour of the day, noting the weight, 

 heat, and moisture of the air, by the barometer, thermometer, and hygro- 

 meter; the point of the winds, and their strength, denoting the several degrees 

 by the numbers 1, 2, 3, 4; the face of the heavens, a short account of the 

 weather, with the depth of rain or dissolved snow, in inches or decimals. This 

 last may be easily estimated by means of a funnel, 2 or 3 feet wide, with an- 

 other vessel to receive the water from it, and a cylindrical measure with a gauge, 

 divided into inches and decimal parts. The situation of the funnel should be 

 such, that whatever wind blows, no part of the rain may be intercepted, either 

 by the intervention of the house, or any other obstacle. The vessel to be close 

 shut every way, that no water may evaporate, having only a small hole to receive 

 the water from the funnel above. 



At the end of every month and year, let the mean height of the barometer 

 and thermometer in each be subjoined; as also the sum of all the depths of the 

 rain, fallen in the whole month or year, the mean height being found by divid- 

 ing the sum of all the heights by the number of the days or observations. 



Such persons as may be pleased to make the observations, are desired to send 

 copies of them for each year to the secretaries of the Royal Society, that they 

 may be compared with the diary kept in London, by order of the Society, it 

 being proposed, that the comparisons and inferences shall be published every 

 year in the Philos. Trans. 



Account of a Booh, entitled, Adversariorum Anatomico- Medico- Chirurgicorum 

 Decas tertia, Auctore Frederico Ruysch, M. D. Ana torn, et Bo tan. Prof, 

 Amstel. R. S. Soc. N° 379, p. 428. 



Ruysch's works are now so generally known, that it is deemed unnecessary to 

 reprint this account of the contents of the 3d decade of his Adversaria. 



