The Dean Bros. of Detroit, the contraetora for building (he addition to tho laboratory, cotumonccd opcrations last Monday iuorning. Workuion have been hirod here and brouht from Detroit, and tho work will be pushfid. Thisis the name tirm that built tho boiler Iiouho. In the new museum building work iáalso progressing tiuely. The floors, it ia expectod, will bo eomplcted next week, and work upon the cuses whieh has beon at a Htund strll tur a timo, han been again resuiued. It is underátood that the work of coniplctíng the building aud its (iiuipments will be puahed forward without interrujition. Workmen are alaoeuiployed in replaeing the plastering of the lowor entrante halls of the niain building with eoiling. It will be remembered that at the last oomraenoement exoreisoa plastoring feil from this place and injurcd aoine of tno pcople who wero paswing out. It has been oonsidered uníate ever siuoo the fire whioh broke out in the hall last year. Tho water ut that time Hoaked down through and looseuod it.