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But these documents are often not easy to use and the collection must be carefully maintained and the students well trained if there is to be any hope they will make effective use of it . An atmosphere promoting good-quality research pervades the whole Department and there is ample evidence of research influencing the curriculum . About halfway through the summer there comes a point where the days and nights are equal length ( equinox ) and it is about this time that most varieties of cannabis begin their flowering cycle . " We are talking about what happens once you get in the door , and to me there 's a much bigger problem of who is able to get in the door and we need to not lose sight of how big an issue that is . The thing has not been sufficiently investigated to say definitely that there is only one or that there is more than one .