208 REPORTS OF" INVEISTIGATIONS AND PROJECTS. 



in 1909. A critical edition of the principal source for the study of early Nor- 

 man law, the "Consuetudines et Justicie" of 1091, was published in the 

 English Historical Review for July, 1908. A study of the administration 

 of Normandy under Henry I is also ready for publication, and progress has 

 been made with the calendar of ducal charters from 1035 to 11 54. 



LITERATURE. 



Sommer, H. Oskar, "Astolat," Camberley, Surrey, England. Grant No. 

 489. Preparation of results of researches on Arthurian romances. 

 (For previous reports see Year Books Nos. 5 and 6.) $2,000. 



Dr. Sommer reports that the last year has been one of the most laborious 

 and the most successful periods in his study of the Arthurian romances. He 

 has been able to settle many disputed questions and his results have been 

 embodied in two publications, which are listed in the bibliography in this 

 volume (pp. 45-52). 



About two months of Dr. Sommer's time during the past year were devoted 

 to the study of manuscripts in the Bibliotheque Nationale, Paris, in the 

 Biblioteca Estense, Modena, and in the Biblioteca San Marco, Venice. He 

 has continued and completed the copy of flf. 1 290-25 ic of the manuscript 

 Add. 10293, forming the contents of the fourth volume of the Vulgate Ver- 

 sion, or "Le Liure de Lancelot," Part H. This fourth volume has been 

 collated with the corresponding portions of five other manuscripts at the 

 British Museum, and Dr. Sommer has been able, by the help of the Paris 

 manuscripts, to recognize four distinct successive stages in the development 

 of the Lancelot. He will not be able to demonstrate fully what light this 

 result will throw on the cycles which preceded the Vulgate until the Lancelot 

 is printed, but proposes to outline briefly the results of all his studies so far 

 in the preface to the Vulgate Version of the Arthurian Romances. 



METEOROLOGY. 



Bjerknes, V., and Sandstrom, J. W., Christiania, Norway. Grant No. 490. 

 Preparation of a zvork on the application of the methods of hydro- 

 dynamics and thermodynamics to practical meteorology and hydro- 

 graphy. (For previous reports see Year Books Nos. 5 and 6.) $1,200. 



Investigations of atmospheric motions from a purely kinematical point 

 of view have been continued, attention being directed mainly towards the 

 vertical movements. These can not generally be made the subject of direct 

 observation, but by making proper use of the equation of continuity, they 

 can be deduced from the observed horizontal components of the motion. 

 Two different methods have been worked out for constructing the vertical 



