232 British Association for the Advancement of Science. 



being made at the proper hours, will be best illustrated by a refer- 

 ence to the account of the Leith observations. — Transactions of the 

 Royal Society of Edinburgh, Vol. X. 



II. That the establishment of such an hourly meteorological re- 

 gister be pointed out as a highly interesting object, in reference 

 especiall)'^ to the important point of intertropical climate, to the 

 Committee of the Association in India. 



III. That the Committee in India be requested to endeavour to 

 institute such observations as may throw hght on the phaenomena of 

 the horary oscillations of the barometer, near the equator. Should 

 the concurrence of the Committee on these points be obtained, it 

 would probably be desirable that the Association should take mea- 

 sures for sending out delicate and accurate instruments. 



IV. That Mr. Phillips and Mr. William Gray, jun. of York be 

 requested to undertake a series of experiments on the comparative 

 quantities of rain falling on the top of the great tower of York 

 Minster, and on the ground near its base. The Committee has been 

 induced to propose this specific question in consequence of the local 

 fitness of the situation, and the facilities offered for its solution by 

 the authorities; but it is to be wished that similar experiments should 

 be made elsewhere, that by an extended comparison of observations 

 light may be thrown upon the anomalies which have been observed 

 at Paris and in other places. 



V. That the Association should express its desire to receive a 

 satisfactory exposition of the theory of the moistened bulb hygro- 

 meter, and that observers be also invited to institute series of com- 

 parative experiments on the indications of the moistened thermo- 

 meter and the temperature of the dew point. 



Note. These indications may be ascertained by Mr. Dalton's pro- 

 cess, or by Mr. Daniell's hygrometer, or by both. Notwithstanding 

 the ingenious and laborious researches of Hutton, De Saussure, 

 Leslie, Anderson, and Gay Lussac upon this subject, scientific de- 

 ductions drawn from more extended experiments are greatly wanted. 

 The simplicity and certainty of the experiment by which the cold 

 produced by the evaporation of water is measured, renders an ac- 

 curate theory of the result peculiarly desirable. The experimenter 

 would do well to consult Mr. Dalton's views on the theory of Hy- 

 grometry, contained in his Meteorological Essays, and in the Man- 

 chester Transactions, and to examine the investigations of Professor 

 Leslie, (Relations of Heat and Moisture, and Supplement to the 

 Encyclopajdia Britannica, Article Meteorology ;) of Dr. Anderson, 

 (Edinburgh Encyclopaedia, Article Hygrometer,) and of M. Gay 

 Lussac, (Biot, Traite de Physique, Tom. II.) A good series of 

 observations at high temperatures will be found recorded in Nos.II. 

 and III. of a Calcutta Journal, entitled Gleanings in Science. 



VI. That experiments on the Decrease of Temperature at increas- 

 ing heights in the Atmosphere be recommended as an important sub- 

 ject for the contributions of observers. 



Note. Series of observations for considerable periods of time on 

 the mean temperature of the air at fixed hours, and at stations of 



which 



