Valuation of the Sea. 
I. 
Animal Life of the Sea-Bottom, its food and quantity. 
(Quantitative Studies.) 
By 
C. G. Joh. Petersen and P. Boysen Jensen. 
Contents. 
Page 
TE tro duet os EEN ESS RR 3 
Im Sourceseforsthef organic matter Intel ses SEE Eee Hd 
HE Depositskoblorganicimatter onsthe-sea-botL oms rene Eee 12 
KV Oreanic matter anthersea WwAbor sr re sk vel e ra Er s lee sst es ENE tres REE SNE HE SKE RE ERE SEERE Re rer KSEE ERE 25 
Vt Eo00dT of the”animal" life; especially ins Danish sfjords 3 sr SEERE erne 34 
VI. New apparatus for the quantitative collection of bottom-animals ..........0000r040… 47 
VIrttMethods! for the 'determination”of the mass of "animal life" SIKRERE SERENE EESER 50 
VIII. Mass and composition of the bottom-fauna at different places in Danish waters...... 53 
FXersTherannual produetionsin general ss ISS SES ER eee 57 
XEEProducers and" consumers'ins the Limfjord im 1909 and 970 eee 58 
See Con clus io DEERE EEN Ee ae ERE TE ere TEENS fe le ce fa lat of skere rare se Le Eee STE DSR SKEER SEKS re TERN KE LS ESTER 69 
Sl em SEE No anse see or SE SEES EG SEE TD TRE OD SR bon od obs ds 73 
SS EN Ore tun NE EET Eee eee skeles tele feles 77 
NVE ERE pla ma o notre ate ES EN SSR EEN ERE ea Eee EEN 79 
6 Tables, 3 Charts and 6 Plates. 

I. Introduction. 
Since 1883 I have been engaged in the study of the animal life of our 
Danish waters; it is only natural, therefore, that the ideas or conceptions, which 
at various times have formed the background for my studies, should gradually 
have altered to some extent. 
In the first instance I endeavoured to obtain some insight into the occur- 
rence of the single species of the bottom-fauna by means of a number of 
dredgings, especially in the Kattegat and Baltic; these investigations were carried 
out onboard the gunboat »Hauch« in the years 13883—87. The results are to be 
found in »Det videnskabelige Udbytte af Kanonbaaden »Hauchs« Togter«. 49. 
464 pages. (Atlas in folio.) 1893. 
