no. 3 fraser : scientific work, velero iii, eastern pacific 261 



Chart Illustrations 



Since to make use of the location of a station as given in latitude and 

 longitude, it is necessary to have recourse to hydrographic charts, a less 

 definite location may be sufficient in many cases, more particularly for one 

 who is familiar with the coast. Consequently, the position of each station 

 relative to some geographic feature, e.g., island or bay, is given as well as 

 the latitude and longitude. 



When the list of collecting stations of the Allan Hancock Pacific Expe- 

 ditions was in progress of compilation, the position of each station with 

 its number was marked on a hydrographic chart. A distinctive color was 

 used for the stations established each year. This provided a visual record 

 of all the stations of such a nature that it is possible to see at a glance the 

 extent of the collecting in each area shown on each chart in each year that 

 this area has been visited. It has done more than this in indicating where 

 it would be most profitable to do further work. 



It is out of the question to reproduce these three dozen charts in this 

 publication, but much of the visual aid may be obtained by reproducing 

 numerous small sections of the charts where collecting has been concen- 

 trated. This has been done in such a way that the position of all the 

 stations, except a very few isolated ones, is indicated. Tracings were made 

 directly from the marked charts (the chart number and the latitude and 

 longitude indicated in each case), and these have been prepared for re- 

 production by Mr. Anker Petersen of the Foundation staff. 



Charts 1 to 10 explain the ten expeditions of the Velero III and are 

 called Expedition charts. Number 11 gives the orientation of charts 12 to 

 18 in connection with the collecting stations of the Velero III in Eastern 

 Pacific waters. Charts 19 to 115 are called Distribution charts. (See pp. 

 368-424 for the list and their localities.) 



