liEl'OKT OF TIIIO PUE8IDEN'J\ 1913. 19 



additional stiinuliis to fundamental work in the difficult but ever 

 fruitful domain of geophysics. In his annual report the Director 

 gives instructive accounts of the effects of pressure in the formation 

 of minerals, of progress in the perfection of adequate appliances for 

 calorimetric measures of minerals, of the factor of temperature in 

 optical studies of crystals, of the results thus far obtained in volcano 

 studies, and of the important economic investigations (now under 

 way at the Laboratory) of the secondary enrichment of copper sul- 

 phide ores. It had been hoped that the signal success attending the 

 studies of Kilauea a year ago might be followed up during the past 

 year, but in this the staff has met disappointment, for the volcano 

 has been inactive and gives no warning of renewed opportunities. 



The activities and productivities of the Laboratory staff are 

 indicated impressively by the 47 papers issued during the year, or 

 now in press, reviewed in the report of the Director. These have 

 been, or will be, published in current journals. Several of them appear 

 as duplicates by reason of translations into the French or the German 

 languages; of these, it is interesting to note that a translation into 

 French by Professor P. Chappuis has been made (for the Journal de 

 Physique) of the work of Day and Sosman on "High temperature 

 gas thermometry," publication No. 157 of the Institution. 



The purposes to which this department is devoted and the pro- 

 grams it proposes to follow have been outlined in the Director's 



Department of ^i^i^^^l reports of the past seven years. He took 

 Historical occasioH also, in December a year ago, when he gave 

 the annual Trustees' Lecture, entitled "The future 

 uses of history," to present a fuller statement of these purposes and 

 programs, as well as to indicate the role which history may fittingly 

 play in the evolution of the social organizations which must occupy 

 the attention of our successors. This instructive lecture was rendered 

 available to a wider circle of interested students of history by publi- 

 cation in The History Teachers' Magazine for February, 1913. 



Briefly stated, the main purposes of the department are two : first, 

 to furnish aids, guides, and reports which may give appropriate 

 direction to the writers of monographs and general histories; and, 

 secondly, to furnish full textual publication of important historical 

 documents. Under the first of these heads the Director reports very 

 favorable progress toward completion of a series of three guides to 

 the materials for American history in London archives and in the 

 libraries of Oxford and Cambridge Universities. The first volume of 

 this series was issued as No. 90 of the Institution's publications in 



