166 



Mr. J. B. N. Hennessey. 



[Dec. 16, 



daily official duties, and with little prospect, though with liearty 

 desire, to command time for more continuous and conclusive results.] 



21. For support and encouragement in making these observations, 

 my acknowledgements are due to Major- General J. T. Walker, C.B., 

 R.E., F.R.S., Surveyor- General of India, whose appreciation of 

 scientific inquiry is well known. 



22. In concluding my remarks on the Mussooree-Dehra observations, 

 I gladly avail myself of the opportunity to heartily thank my friend 

 Mr. W. H. Cole, M.A., whose skill as a trained observer, and wdiose 

 co-operation in general have enabled him to render valuable aid. 



Observations by Captain J. P. Basevi, B.JE. 



23. It only remains to offer a few words on the results, exhibited in 

 Table X, of actinometrical observations made by my friend the late 

 Captain J. P. Basevi, R.E., of the Great Trigonometrical Survey of 

 India. 



24. When this officer, in course of the pendulum observations, 

 was about to resume his travels in 1871, it occurred to us that he 

 might utilise some rare opportunities for actinometrical observations 

 which would present themselves at points of considerable height above 

 sea level that he would certainly need to pass over. With his usual 

 love for scientific research, Basevi readily consented to use the actino- 

 meter on suitable occasions, and he was accordingly provided by me 

 with the instrument A of the Royal Society. The intention to observe 

 at great heights was unhappily frustrated by his lamented death, or 

 there is no doubt he would have secured valuable results at very con- 

 siderable altitudes, including the Takalung La, or pass, on which he 

 stood at 18,060 feet above sea level. He, however, took some pre- 

 liminary observations at small heights, chiefly at Srinagar, the capital 

 of Kashmir. 'Not being sufficiently numerous for a separate communi- 

 cation, they have remained in my hands since 1871, when they were 

 taken, awaiting an opportunity, such as now presents itself, for placing 

 them on record. This is done in Table X. 



